Transform.root

Description

返回层级视图中最顶层的变换。

（永远不返回 null；如果该变换没有父级，则返回自身。）

using UnityEngine;

public class Example : MonoBehaviour
{
    // Is a collision between two objects with different roots?
    void OnCollisionEnter(Collision collision)
    {
        if (collision.transform.root != transform.root)
        {
            print("The colliding objects are not in the same hierarchy");
        }
    }
}